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手工翻译：
在上一章，我们主要处理了对数效用最优化的问题。
In the last chapter, we mainly solved logarithmic utility optimization problem
而在当前的关于投资组合优化问题的学术研究中，还有其他一些广泛采用更复杂的效用函数，比如线性效用函数。
And now about investment optimization problem studying, there are other more complecated and more extensive used utility functions, like linear utility function.
在这一章，我们主要以指数效用函数为例探讨其他效用函数最优化的问题。
in this chapter, we mainly use exponential function to compare with other utility functions about optimization problem
不确定optimization problem是不是最优化问题
请帮忙翻译一句话，只要人工的
During working at Agricultural Bank of China , I organized and took part in many activities about charity and donation positively. such as , delivering many used-computers to a primary school in Shao Guan , contributing money for WenChuan where has an earthquake , and blood donation , etc .